linux-kernel - Re: Re: [PATCH V2 3/5] PCI: tegra: Add support for PCIe endpoint mode in Tegra194

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Date:   Mon, 13 Jan 2020 23:42:55 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Thierry Reding <thierry.reding@...il.com>
CC:     <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <robh+dt@...nel.org>, <jonathanh@...dia.com>,
        <andrew.murray@....com>, <kishon@...com>,
        <gustavo.pimentel@...opsys.com>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, <sagar.tv@...il.com>
Subject: Re: Re: [PATCH V2 3/5] PCI: tegra: Add support for PCIe endpoint mode
 in Tegra194



On 1/6/20 6:44 PM, Thierry Reding wrote:
> On Fri, Jan 03, 2020 at 06:14:02PM +0530, Vidya Sagar wrote:
>> Add support for the endpoint mode of Synopsys DesignWare core based
>> dual mode PCIe controllers present in Tegra194 SoC.
>>
>> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
>> ---
>> V2:
>> * Addressed Bjorn's review comments
>> * Made changes as part of addressing review comments for other patches
>>
>>   drivers/pci/controller/dwc/Kconfig         |  30 +-
>>   drivers/pci/controller/dwc/pcie-tegra194.c | 782 ++++++++++++++++++++-
>>   2 files changed, 796 insertions(+), 16 deletions(-)
>>
> [...]
>> diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
>> index cbe95f0ea0ca..6621ac79efee 100644
>> --- a/drivers/pci/controller/dwc/pcie-tegra194.c
>> +++ b/drivers/pci/controller/dwc/pcie-tegra194.c
> [...]
>> @@ -1427,8 +1620,553 @@ static int tegra_pcie_config_rp(struct tegra_pcie_dw *pcie)
> [...]
>> +static int tegra_pcie_config_ep(struct tegra_pcie_dw *pcie,
>> +				struct platform_device *pdev)
>> +{
> [...]
>> +	ret = devm_request_irq(dev, pcie->pex_rst_irq,
>> +			       tegra_pcie_ep_pex_rst_irq,
>> +			       IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
>> +			       name, (void *)pcie);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to request IRQ for PERST: %d\n", ret);
>> +		return ret;
>> +	}
>> +	disable_irq(pcie->pex_rst_irq);
> 
> I just came across this while reviewing another patch: it looks like a
> better way to handle "disabled by default" interrupts is to do this:
> 
> 	irq_set_status_flags(rtc->irq, IRQ_NOAUTOEN);
> 
> before calling devm_request_irq(). See here for an example:
> 
> 	http://patchwork.ozlabs.org/patch/1217944/
I'll take care of it.

Thanks for the review.
Vidya Sagar

> 
> Thierry
>